go: add «1679. Max Number of K-Sum Pairs»

Signed-off-by: Matej Focko <me@mfocko.xyz>

go/max-number-of-k-sum-pairs.go

@@ -0,0 +1,24 @@
+package main
+
+import "slices"
+
+func maxOperations(nums []int, k int) int {
+	slices.Sort(nums)
+
+	operations := 0
+
+	l, r := 0, len(nums)-1
+	for l < r {
+		if nums[l]+nums[r] == k {
+			operations++
+			l++
+			r--
+		} else if nums[l]+nums[r] < k {
+			l++
+		} else {
+			r--
+		}
+	}
+
+	return operations
+}